论文信息 - A 90 element CdTe array detector

A 90 element CdTe array detector

Abstract The fabrication of a CdTe array radiation detector and its radiation detection characteristics are described. In order to obtain high efficiency of charge collection and realize uniform detection sensitivity, current-voltage characteristics with the combination of large and small barrier height contacts and three kinds of CdTe crystals have been investigated. It was found that the Schottky barrier height of electroless Pt deposition was 0.97 eV, which effectively suppressed electron injection. By using the crystal grown by the travelling heater method with a Cl concentration of 2 ppm, carrier lifetimes for electrons and holes of 1.0 and 0.5 μs, respectively, were achieved. A 90 element array detector exhibited an energy resolution as low as 4.5 keV and a count rate variation of less than 5% for 60 keV γ-rays.

[1] P. Siffert,et al. Cadmium Telluride Nuclear Radiation Detectors , 1975, IEEE Transactions on Nuclear Science.

[2] A. Tepore,et al. Characterization of CdTe with photoelectronic techniques , 1977 .

[3] P. Siffert,et al. Structural defects in high resistivity cadmium telluride , 1989 .

[4] G. Entine,et al. Cadmium Telluride Gamma Camera , 1979, IEEE Transactions on Nuclear Science.

[5] T. Ikoma,et al. Computer-aided analysis of GaAs n-i-n structures with a heavily compensated i-layer , 1986, IEEE Transactions on Electron Devices.

[6] G. Entine,et al. Survey of CdTe nuclear detector applications , 1989 .

[7] G. Entine,et al. Properties of a New CdTe Detector for Nuclear Medicine , 1987, IEEE Transactions on Nuclear Science.

[8] R. Bell. Calculation of gamma-ray pulse height spectrum in a semiconductor detector in the presence of charge carrier trapping , 1971 .

[9] G. Entine,et al. Development of two new M-π-n CdTe sensors , 1989 .